Question about 1979 Harley Davidson XLH 1000 Sportster

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Why do i have to prime my oil pump after every oil change?otherwise no oil pressure..79 ironhead...

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You shouldn't be having to prime the oil pump with every oil change. If you're running the original oil tank in it's original position, when you drain the tank by removing the plug at the bottom of it, the oil line from the bottom of the tank going to the oil pump is still full of oil. As long a you're not doing something to drain that line, you should not have to prime the pump. It sounds like to me that you're removing the oil feed line to the pump in order to drain the tank. If you're doing it this way, you will have to prime the pump every time. Drain the oil from the oil tank by removing the drain plug from the tank.

Good Luck
Steve

Posted on Aug 05, 2010

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1 Answer

Had the pressure bypass valve malfunction on my 2.5 jeep put new oil pump in and with 45lbs. Oil pressure motor still sounds dry of oil,what gives?


it's not priming.
that grease trick helps.
is this some china pump off fleabay or a real jeep pump..???
did you do the below.:
1: the grease sure. and then prime the filter and the gallery behind the
filter.
2: With fuel and spark defeated, and spark plugs removed then with pressure gauge attached to sender port, did you crank it to get max pressure (my guess is this is the step you are posting on.)
i never start any engine, (after majors) unless i get #2 to work first the number 3, which is top end oil checks.

the pump is no priming.
In pro shops they make up a priming tool. so new engines are never
started, 1st time dry, ever.
one way is just a tank full of oil and shop air, and 2 valve.


maybe the new pumps relieve valve is stuck open, fully.
i rebuild my own classic engines, after all that work !!! i never
ever, skip these steps.
and for 100% sure, good pressure, and top end oiling on any major work.
one of the top brand pump makers. VIDEO
http://www.youtube.com/watch?v=tOYLlr8uQ8k
NEVER !

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1 Answer

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5. Piston rings badly worn or broken.
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Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e

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1 Answer

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1 Answer

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1 Answer

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1 Answer

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1 Answer

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